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Date:   Wed, 19 Aug 2020 10:16:56 -0700
Message-Id: <20200819171656.2650926-1-furquan@google.com>
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Subject: [PATCH] drivers: acpi: apd: Check return value of acpi_dev_get_property
From:   Furquan Shaikh <furquan@google.com>
To:     "Rafael J . Wysocki" <rjw@rjwysocki.net>,
        Len Brown <lenb@kernel.org>
Cc:     adurbin@google.com, akshu.agrawal@amd.com,
        linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org,
        Furquan Shaikh <furquan@google.com>
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Sender: linux-kernel-owner@vger.kernel.org
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`fch_misc_setup()` uses `acpi_dev_get_property()` to read the value of
"is-rv" passed in by BIOS in ACPI tables. However, not all BIOSes
might pass in this property and hence it is important to first check
the return value of `acpi_dev_get_property()` before referencing the
object filled by it.

Signed-off-by: Furquan Shaikh <furquan@google.com>
---
 drivers/acpi/acpi_apd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/acpi_apd.c b/drivers/acpi/acpi_apd.c
index 4c348377a39d..806b8ce05624 100644
--- a/drivers/acpi/acpi_apd.c
+++ b/drivers/acpi/acpi_apd.c
@@ -99,8 +99,8 @@ static int fch_misc_setup(struct apd_private_data *pdata)
 	if (ret < 0)
 		return -ENOENT;
 
-	acpi_dev_get_property(adev, "is-rv", ACPI_TYPE_INTEGER, &obj);
-	clk_data->is_rv = obj->integer.value;
+	if (!acpi_dev_get_property(adev, "is-rv", ACPI_TYPE_INTEGER, &obj))
+		clk_data->is_rv = obj->integer.value;
 
 	list_for_each_entry(rentry, &resource_list, node) {
 		clk_data->base = devm_ioremap(&adev->dev, rentry->res->start,
-- 
2.28.0.220.ged08abb693-goog